Advice - Plumbing Problem - Idiot tenants

[Brie Schmidt]

So my idiot tenants used paper towels as toilet paper for some time and clogged their 3rd floor bathroom.  The first floor and second floor tenants have not been having problems.  We had the handyman out about a month ago and he pulled out 2-3 rolls of paper towels.  Then last week the tenants complained that the toilet was not flushing and it was backing up into the bathtub.  

I had the main rodded down all three floors and the problem was solved.  Yesterday it started happening again, you flush the toilet and the bowl fills up with water.  If you plunge it then it backs up into the bathtub.  The sewer company came out again yesterday and rodded it 75 feet and it was all clear, but then it started happening again. 

I have been out there 5 times and have had two different sets of professionals come out.  Any advice or ideas on what the problem is?